How to remove repeated adjacent characters in a string?

Question:

How to remove repeated adjacent characters in a string?

Code:

public class RemoveRepeatedChars {
 
  public static void main(String[] args) {
 
    String str = "aabbccddeefffffg";
    System.out.println(str);
 
    String regex = "(.)\\1{1,}";
    str = str.replaceAll(regex,"$1");
 
    System.out.println(str);
 
  }
} 

Output:

$ java RemoveRepeatedChars
aabbccddeefffffg
abcdefg